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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Main Rotor Yoke Cracking

By
S.R. Lamb
S.R. Lamb
DSTO Aeronautical Research Laboratory
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;
G. Clerk
G. Clerk
DSTO Aeronautical Research Laboratory
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Published:
1992
Page range:
36 - 38

Abstract

The 4340 steel main rotor yoke of a helicopter failed during a hovering exercise. Visual examination of the yoke revealed no evidence of gross external damage. Visual fracture surface examination, macrofractography, scanning electron micrography, and metallography of a section cut from the yoke in the region of the cracking indicated that the failure was caused by fatigue-crack initiation and growth from severe corrosion damage to a pillow-block bolt hole. Corrosion occurred because of failure of the protection scheme. An upgraded corrosion protection scheme for the bolt holes was recommended, along with nondestructive inspection of the region at intervals determined by fractographic analysis of the fatigue crack growth.

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S.R. Lamb, G. Clerk, 1992. "Main Rotor Yoke Cracking", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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